SSLSocketTest: interrupt_read is too flaky

The interrupt test is very flaky currently, because there isn't a good
way to know when the thread we're waiting for is blocked in read. Try to
inspect the stack trace to see if one of the methods is "read" as an
attempt to make it less flaky.

Change-Id: I8503d645ffd5793f6e2fdc20692fbbb4d94cc37c
1 file changed